Alessio was born and raised in Vancouver where he began training in Brazilian jiu-jitsu and kickboxing, before moving to San Jose, California at the age of 19 in order to pursue his dream of becoming a professional fighter. During his professional mixed martial arts career, Alessio has also won two national BMX trick biking championships.[1]

On April 3, 2012 it was reported that Alessio has returned to the UFC to replace an injured Matt Wiman and face Mark Bocek at UFC 145. Alessio was defeated via unanimous decision (30-27, 29-28, 30-27).[6]

On September 13, Alessio signed with Aggression Fighting Championship. He headlined their AFC 13 show in Victoria, British Columbia on November 3.[9] Alessio faced Dave Mazany in the main event.[10] The bout ended in No Contest due to Mazany accidentally poking Alessio in the eye.[11]

Alessio was scheduled to fight Tim Radcliffe at Global Warrior Challenge on June 29, 2013. However, he announced on Twitter on June 8 that a staph infection forced him to withdraw from the bout. Following that, Alessio announced that he had signed with Bellator MMA and will fight in the Lightweight tournament.[12]

Alessio was originally scheduled to face Guillaume De Lorenzi at Bellator 119 on May 9, 2014.[13] However, De Lorenzi was forced out of the bout due to injury, and Alessio instead fought Eric Wisely at the event.[14] He won the fight via unanimous decision.